CN203014683U

CN203014683U - Household circuit structure capable of converting three-phase power into single-phase power

Info

Publication number: CN203014683U
Application number: CN 201220706763
Authority: CN
Inventors: 王奉瑾
Original assignee: ZHONGSHAN PURUNSI POWER SUPPLY EQUIPMENT TECHNOLOGY Co Ltd
Current assignee: ZHONGSHAN PURUNSI POWER SUPPLY EQUIPMENT TECHNOLOGY Co Ltd
Priority date: 2012-12-19
Filing date: 2012-12-19
Publication date: 2013-06-19
Anticipated expiration: 2022-12-19

Abstract

Disclosed in the utility model is a household circuit structure capable of converting three-phase power into single-phase power. The household circuit structure comprises a first single-phase transformer connected to an A phase line a B phase line and a second single-phase transformer connected to a B phase line and a C phase line; a switch capacitor set is arranged between the A phase line and a C phase line; and the secondary winding output terminals of the first single-phase transformer and the second single-phase transformer are connected in series and then are connected to a power consumption loop. A current transformer for detecting a current magnitude is arranged at the power consumption loop; and a controller for controlling capacitor switching in the switch capacitor set according to the setting to balance the three-phase currents is connected to a signal output terminal of the current transformer. The objectives of the utility model are as follows: the conversion of single-phase power from three-phase power is realized by the first single-phase transformer and the second single-phase transformer and the 220-V household power is outputted and is provided for a load; and the current transformer is used to carry out current detection and thus the switching of the switch capacitor set is controlled and the phase between the A phase line and the C phase line is controlled to balance the three-phase currents, thereby reducing the unbalancing of the three phases and the influence on the power grid.

Description

A kind of tool three-phase electricity turns the domestic circuit structure of single-phase electricity

[technical field]

The utility model relates to for the distribution field, and particularly a kind of tool three-phase electricity turns the domestic circuit structure of single-phase electricity.

[background technology]

In actual life, a lot of electricity consumption occasions adopt the single-phase electricity power supply, and use three-phase alternating current in the electrical network transmission overwhelming majority, from the three phase supply to the single-phase electricity, to constantly note the current balance type of three-phase electricity phase line, can adopt three power lines in current balance type is three-phase three-wire system power supply, if when three-phase electricity is used every phase electricity consumption imbalance will to install the balance ground wire additional be so-called three-phase four-wire power supply.

But in fact because present various non-linear electrical equipments are numerous, the various harmonic waves of electrical network are numerous, may not guarantee the three-phase equilibrium use, so must adopt the four-wire system power supply, with a wherein phase of three-phase electricity and the single-phase electricity of zero line composition 220V, but this mode, because the load of the every phase of three-phase electricity is different, cause every phase current different, cause neutral line current unbalanced, have electric current to flow through in zero line, when every phase load differs larger, total current in zero line can be very large, needs the sectional area of zero line very large, wasted material.

In present the construction of housing, the unbalanced problem of three-phase electricity consumption is especially serious, due to the consumption habit that can't judge the each household resident, have to each single-phase electricity in three-phase electricity be distributed in resident resident family according to certain rule, complicated due to existing resident resident family, the three-phase electricity consumption can not be balanced, when especially current break is very large, brought great hidden danger for safe safety utilization of electric power, easily the initiation fire accident.

For overcoming the above problems, needing a kind of can with three-phase electricity evenly for the method for each electric terminal, can equivalence be all perhaps three phase supply with each electric terminal.

[utility model content]

The utility model has overcome the deficiency of above-mentioned technology, provide a kind of tool three-phase electricity to turn the domestic circuit structure of single-phase electricity, it realizes that by the first single-phase transformer and the second single-phase transformer three-phase turns single-phase, the household electric of output 220V, it realizes simple, cost performance is good, then controller carries out current detecting by current transformer, control the switching of switching capacitance group according to testing result, between adjusting A phase line and C phase line, phase place is come balanced three-phase current, reduce the imbalance of three-phase, reduce the impact on electrical network.

For achieving the above object, the utility model has adopted following technical proposal:

a kind of tool three-phase electricity turns the domestic circuit structure of single-phase electricity, include: armature winding two ends are connected on respectively the first single-phase transformer T1 on three-phase alternating current A phase line and B phase line, the armature winding two ends are connected on respectively the second single-phase transformer T2 on B phase line and C phase line, be provided with between A phase line and C phase line for the switching capacitance group 1 of regulating phase place between A phase line and C phase line, described the first single-phase transformer T1 secondary winding and the second single-phase transformer T2 secondary winding are connected in series, its two output is used for and is connected to form the electricity consumption loop with electric loading, be provided with the current transformer 2 for detection of size of current in described electricity consumption loop, be connected with the controller 5 that comes balanced three-phase current according to capacitor switching in setup control switching capacitance group 1 on described current transformer 2 signal output parts.

As optimization, the no-load voltage ratio of described the first single-phase transformer T1 and the second single-phase transformer T2 is all to be 380V/150V.

As optimization, the no-load voltage ratio of described the first single-phase transformer T1 and the second single-phase transformer T2 is all to be 220V/150V.

4 capacitor C 1 ~ C4 that described switching capacitance group 1 comprises into parallel connection structure with and corresponding fling-cut switch S1 ~ S4.

The beneficial effects of the utility model are:

1, realize that by the first single-phase transformer and the second single-phase transformer three-phase turns single-phase, the household electric of output 220V offers load, so can regard whole family expenses terminal circuit as the three-phase input, it realizes simple, cost performance is good, and applicability is strong, is convenient to applying of three-phase electricity.

2, controller carries out current detecting by current transformer, then controls the switching of switching capacitance group, and between adjusting A phase line and C phase line, phase place is come balanced three-phase current, reduces the imbalance of three-phase, reduces the impact on electrical network.

[description of drawings]

Fig. 1 is circuit theory diagrams of the present utility model.

[embodiment]

Be described in further detail below in conjunction with accompanying drawing and execution mode of the present utility model:

as shown in Figure 1, a kind of tool three-phase electricity turns the domestic circuit structure of single-phase electricity, include: armature winding two ends are connected on respectively the first single-phase transformer T1 on three-phase alternating current A phase line and B phase line, the armature winding two ends are connected on respectively the second single-phase transformer T2 on B phase line and C phase line, be provided with between A phase line and C phase line for the switching capacitance group 1 of regulating phase place between A phase line and C phase line, described the first single-phase transformer T1 secondary winding and the second single-phase transformer T2 secondary winding are connected in series, its two output is used for and is connected to form the electricity consumption loop with electric loading, be provided with the current transformer 2 for detection of size of current in described electricity consumption loop, be connected with the controller 5 that makes three-phase balance according to capacitor switching in setup control switching capacitance group 1 on described current transformer 2 signal output parts.

as mentioned above, if the remote power feeding end adopts the three-phase and four-line method for making power supply of star, the input phase voltage that is three-phase electricity is 220V, line voltage between A phase line and C phase line is 380V, line voltage between B phase line and C phase line is 380V, the no-load voltage ratio of described the first single-phase transformer T1 and the second single-phase transformer T2 all adopts 380V/150V, if and the remote power feeding end adopts the delta connection power supply, phase voltage and line voltage equate, be all 220V, the no-load voltage ratio of described the first single-phase transformer T1 and the second single-phase transformer T2 all adopts 220V/150V, the final like this alternating current of distinguishing phase phasic difference 120 degree of transformation output 150V by transformer, because two transformer outputs are connected in series, the family expenses alternating current of exporting 220V by vector offers electricity consumption negative resistance RL.

As mentioned above, said apparatus can be mapped as the load RL in the electricity consumption loop three-phase input, input is three-phase alternating current input A, B, the C that the first elementary pitch of the laps of single-phase transformer T1 and the second elementary pitch of the laps of single-phase transformer T2 connect to form, in this transformer due to the load imbalance of three phase lines of input, need to add phase compensation electric capacity between A phase and C phase, come balanced three-phase current with phase place between adjusting A phase and C phase.

as mentioned above, 4 capacitor C 1 ~ C4 that comprise into parallel connection structure in the group of switching capacitance described in this case 1 with and corresponding fling-cut switch S1 ~ S4, the parallel combination of 4 electric capacity has 16 kinds of compound modes, select suitable capacitance such as capacity to be respectively 15uF, 30uF, 60uF, 120uF, and current transformer 2 employing heap(ed) capacities are 100A, so four quantifications are carried out in the output of current transformer 2, controller 5 control capacitance switchings, can obtain from the electric capacity of the interval 15uF of 15uF ~ 225uF, the increase that electric current detected according to current transformer 2 increases the size of switching capacitance, reduce and reduce the size of switching capacitance, come balanced three-phase current with the phase place of regulating between A phase line and C phase line.

As mentioned above; what this case was protected is the domestic circuit structure that a kind of tool three-phase electricity turns single-phase electricity; it realizes that by the first single-phase transformer T1 and the second single-phase transformer T2 three-phase turns single-phase, the household electric of output 220V, and it realizes simple; cost performance is good; then controller 5 carries out current detecting by current transformer 2, controls the switching of switching capacitance group 1 according to testing result, and the phase place of regulating between A phase line and C phase line is come balanced three-phase current; reduce the imbalance of three-phase, reduce the impact on electrical network.All or this case embodiments identical with this case structure are equal to replacement and should be shown in the protection range that falls into this case.

Claims

1. a tool three-phase electricity turns the domestic circuit structure of single-phase electricity, it is characterized in that including: armature winding two ends are connected on respectively the first single-phase transformer (T1) on three-phase alternating current A phase line and B phase line, the armature winding two ends are connected on respectively the second single-phase transformer (T2) on B phase line and C phase line, be provided with between A phase line and C phase line for the switching capacitance group (1) of regulating phase place between A phase line and C phase line, described the first single-phase transformer (T1) secondary winding and the second single-phase transformer (T2) secondary winding are connected in series, its two output is used for and is connected to form the electricity consumption loop with electric loading, be provided with the current transformer (2) for detection of size of current in described electricity consumption loop, be connected with the controller (5) that comes balanced three-phase current according to capacitor switching in setup control switching capacitance group (1) on described current transformer (2) signal output part.

2. a kind of tool three-phase electricity according to claim 1 turns the domestic circuit structure of single-phase electricity, it is characterized in that described the first single-phase transformer (T1) and the no-load voltage ratio of the second single-phase transformer (T2) are all to be 380V/150V.

3. a kind of tool three-phase electricity according to claim 1 turns the domestic circuit structure of single-phase electricity, it is characterized in that described the first single-phase transformer (T1) and the no-load voltage ratio of the second single-phase transformer (T2) are all to be 220V/150V.

4. a kind of tool three-phase electricity according to claim 1 turns the domestic circuit structure of single-phase electricity, it is characterized in that described switching capacitance group (1) comprise into 4 electric capacity of parallel connection structure (C1 ~ C4) with and corresponding fling-cut switch (S1 ~ S4).